Safety-stop for elevators.



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I t I Patented Apr. 18, 1911.

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A TTORNHS.

E. KOPPELL.

SAFETY STOP FOR ELEVATORS.

11 1 110111011 FILED AUG. 11, 1910.

P11611181 Apr. 13,1911.

2 SHEETS-SHEET 2.

1llll-lllllll H ATTORNEYS srairns. ra rnnr orrren EDWARD KOPPELL, or New roux, N. Y.

sarnrrs'ror FOR ELEVATORS.

may concern! Be. it known that l, Ernvaao Korrann, a 01 ize'n ot' the" United tatates, \Iltl a resident ,gaif the city of New York, borough of Brook- &. gin the eouz'ity of Kings and 'State of on I e v ,York, haveinvented a new and Inn ed Safety-Stop 't'or'lllevators, of which following is a full, clear, and exact aei-ption. J l

The invention is an in'lprovement in safety stops for elevators, and has in view a relaely simple and reliable appliance to open ti the clanuiing jaws or apply the brakes,

or, ping; runways so that it is inipossible for the cable to slip thereabout.

vReference is to be had to the accompanysocation, inwhich similar characters of refer-- ence indicate correspondingparts in all the views. I

. M Figure 1 is an inverted plan of tliw01 a, voter car, showing that portion of the safety stop icarried thereby embodying); my ilYl- ,guides for oneset of the brake sheaves being a, shown 1n section; Fig. 2 1s a vertical section i -substantially on the line L42 or Fig. 1;

fr; portion of the stop device arranged in the elevator shaft; and Fi r. 4 is an edge view of a sheave wliiehit'orins a prime feature of my invent-ion. i

In the construction or a safety stop for elevators in accordance with my invention, ""any suitableclamping or l'irall'inn' ineeha nism may be provided. For (-(uivenieneo ol' illustration l: have shown such to consist oi: pairs of lovers arranged at each side and beneath the elevator ear 6, each lever 5 o? each pair having a clamping jaw or braho shoe 7, arranged at one side'of its 'fllllillllll to bind against one side of the usual guide rail 8; and a roller 9 at the opposite side of its fulcrum, between which and the roller 1e saute kllllbtflilyll lg .a's a prime feature aslieave and causes the two of sheaves to approacl'i each other, the sheaves ot the ompoiuid sheave pretm'ably having grip-- mg drawings forming a part of this specifii provements, the elevator guides and the o yFig. 3 is a side View of the ear, HllUWil'lf" that.

Specification of Letters Patent.

Application filed August 11,, 1910. Serial No. 576,731.

of the opposite lever paeseslhe euslminiry expanding wedge 10, in connection with the uiovablysupported strap or frame l. in accordance with my invention, l. provide the strap 11 with sets of sheaves 1:3 and lit re spectively, the sheave 12 being in the nature of a compound sheave and comprising two sheaves of relatively dili lireut diauuiters.

"The set .iit"sheaves it) is shown to be of the same diameter and imlepemlently revoluble Opposite the interval between the two sets of sheaverll and 13 is carried on the car a compound idler sheave 14, also embodyinn sheaves of relatively different, diameters arranged. similarly to the sheaves of the compound sheave 12, shown in the present embodin'ient of the invention, with the sn'ialler sheave arranged above the larger. lhe guide or idler sheave 15 is also carried by the car, shown to be z'tdjaeent to one of the brakes; and at the op )osite, side of the car adjacent to the other brake is a set of two guide sheaves 16., I

I have shown in Fig. at the top oi. the elevator shaft a safety stop governor 1'7 to: elevators, the governor being or well-known construction and operation in the art and not requiring a specific description, the go ernor operating, when the down speed of the car exceeds a predetermined rate, to clamp the dewnwardly-moving length, or branch of the safety stopeable 18. This cable, as shown, is looped about the governor SllQZlVO'fiIHl. a weighted sheave 19 at the bottom of the shaft, the downiworally-moving length-of cable, when the car is dropping, passing underneathone of the sheaves of the set of guide sheaves 16; thence about the larger sheave of the compound idler guide sheave ll; thence around the large sheave of the compound sheaveli; thence around one of the sheaves of the set of :lheaves 13, thence around the small sheave of the compound sheave Z12; them-e around the other sheave oi the eheave l3; thence about the small guide sheave oi the compound sheave '14 from which the cable passes sueeesi-iiveiy about the idler sheave l5 and over the other sheave llGlto the weighted sheave 10 to the sheave l7 oi? the governor. By this construrtiou and arrangement of theseveral parts, when the ele 'ator car ex eeds a rate in its downwardtravel beyond a prtaleten mined speed, the governor throws in the clamp, stopping the further movei'nent of the downwardly-traveling length of the cable sheaves 12 and 13 will fixed sheaves of over the governor sheave. The further descent of the car then draws'on this length ofthe cable and pulls it from the loop arranged about the sets of sheaves 12 and 13. As the sheaves of the compound sheaves 12 and 14, from which the cableis. drawn, are relatively larger than their companion sheaves, by which the cable is applied, the two sets of travel toward each other and-apply the. clamp or brake to the guide rails. In'order, however, that this operation may take place with certainty, it is essential that the cable does not slip on the compound sheaves. To insure this, I construct the runway of each sheave in the form of 'a relatively deep V-sha ed groove, whereby the opposite faces 0 the runway will bind the cable with the mill on the cable.

It is obvious that the set of sheaves 14 could be made up of sheaves independently revoluble and of the same diameter. However, by constructing it as the sheave 12, the slipping of the cable is further guarded against. r

Having thus described my invention, I claim as new and desire to secure by Letters Patent: g l

1. 'The combination of an elevator brake, two sets of sheaves relatively movable to and from each other to operate the brake, with one of said sets fixed sheaves of different working diameters, and a safety stop cable looped about the sheaves.

2. The combination of an elevator brake, two sets of sheaves relatively movable to and from each other to operate the brake, one set of said sheaves embodying two relatively different working diameters having gripping runways, and a safety stop cable looped about the sheaves.

3. In an elevator safety stop, an'elevator brake, a safety stop cable, and means to apply the brake through the operation of the cable, having a compound sheave with the sheaves thereof of relatively different diameters and over which the cable passes.

4. Thecombination of an elevator brake, two sets of sheaves relativelymovable to and from each other to operate the brake, with one set of sheaves embodying two relatively with a grip which increasesthence looped embodying two relatively fixed sheaves of different diameters, and a safety stop cable looped about the two sets of sheaves and arranged to draw the cable from the larger sheave of the last-named set of sheaves in the operation of-the brake.

5. The-combinatlonof an elevator brake, two sets of sheaves relatively movable to and from each other to opesate the brake, a third set of sheaves, the sheaves of one of said sets and third set of sheaves each embodying tworelatively fixed sheaves of different working diameters, and a safety stop cable looped about the two sets of sheaves and passing about'the third set of sheaves, with the cable extending-from the larger sheave of that set of sheaves of the two sets having different diameters, around the larger sheave of the third set of sheaves.

6. The combination of an elevator car, a brake carried bythe car, relatively movable to and from eachother to operate the brake, carried by the car, one set of the said sheaves embodying two relatively two sets of sheaves fixed sheaves of dilferent'worki ng diameters,-

guide sheaves, a governor, a weighted sheave, and a stop cable carried by the governor, with the downwardly-moving length of said cable, when the car is traveling downwardly, passing over one of the guide sheaves;

and passing therefrom over the otherguide sheave to and about the weighted sheave.

7. The combination of anelevator car, a brake carried by the car, two sets of sheaves relatively movable to and from each other to operate the brake, one of the sheaves of one set relatively fixed to -the other sheave ofthe said set and of relatively larger diameter, and a safety stop cable wound'a out the two sets of sheaves, with the windings arranged to cause the sheaves to approach each about the two sets of sheaves l other and applythe brake when the cable is drawn from the set of sheaves having the sheaves of different diameters.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

EDWARD KorrELL.

lVitnesses: 4

W, w. Hem; JOHN P. DAVIS. 

